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The physical plant at the main campus of a large state university receives daily requests to...

The physical plant at the main campus of a large state university receives daily requests to replace fluorescent lightbulbs. The distribution of the number of daily requests is bell-shaped and has a mean of 51 and a standard deviation of 4. Using the 68-95-99.7 rule, what is the approximate percentage of lightbulb replacement requests numbering between 43 and 51? Answer to the nearest tenth.

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Answer #1

We have  

The distribution of the number of daily requests is bell-shaped and has a mean = 51 and a standard deviation = 4

We asked percentage of lightbulb replacement requests numbering between 43 and 51

Using empirical rule

   - 2* = 51 - 2*4 = 43

The percentage of lightbulb replacement requests numbering between = 43 and = 51 is 47.5%

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